"cannot convert null to an object" in a triggerscript

Hi @all,

i'm now outing me as a non-programmer

We have following problem: in an item were three datefields. The first field should be filled by the user, and the other two fields should be computed by a rule. Because filling a datefield by a computation it is not editable anymore we wanted to use a trigger to do this.

This works fine unless the user doesnt fill the first datefield. Then we get a javascript error:

"Internal Error: undefined: Cannot convert null to an object."

Here comes the code from the triggerscript:

try

{

var issue = bsf.lookupBean("imIssueDeltaBean");

var params = bsf.lookupBean("parametersBean");

var fieldDueDate = params.getParameter("Startfeld");

var CompValue = params.getParameter("Anzahl Tage");

var targetField = params.getParameter("Zielfeld");

}

function main()

{

var StartDate = issue.getNewFieldValue(fieldDueDate);

var StartDate = new Date().setTime(StartDate.getTime()+(CompValue*24*60*60*1000));

issue.setFieldValue(targetField, StartDate); // set field to due date

}

}

The red line is the one which causes the error.

The Trigger-Config has three fields:

• "Startfeld" (the first datefield),
• "Zielfeld" (the target datefield)
• "Anzahl Tage", which holds the Number of days to compute with.

So how we get rid of this Javascript-Error? First we tried to catch an empty field by the trigger-rule with looking for a "Startfeld" != -unspecified-

but this doesnt work. So we tried to get this in the script by an if-statement in the main-function like:

if (fieldDueDate != null)

but this has no effect, this if-Statement is always false.

Other if-Statements were

if (!fieldDueDate)

or

if (!isNaN(fieldDueDate))

are always true, so we never get into the function. Can someone help me, please ? Thanks in advance...

kind regards, Jens